DATA TRANSMITTER BETWEEN CONTROLLERS

摘要

PURPOSE:To reduce the number of transmission lines by superimposing a signal on a power line in the data transmission between microcomputers. CONSTITUTION:In transmitting a data from a controller 1 to a controller 2, a signal from a microcomputer 3 drives a transistor 12 and the signal is transmitted to a power supply section 5 while being superimposed thereupon. Power is extracted from a reception signal through a diode 16, a capacitor 18 and a resistor 17 at the reception side and impresses the power to a power supply terminal VCC of the microcomputer 4. Further, this signal is impressed to a voltage comparator 20 via a resistance 21. A reference signal obtained by rectifying and smoothing the former signal through a diode 23, a resistance 24 and a capacitor 25 is impressed to the other input of the voltage comparator 20.